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Co-cubstitution effects on the Fe valence in the BaFe2As2 superconducting compound : a study of hard x-ray absorption spectroscopy

dc.contributor.authorBittar, Eduardo Matzenbacherpt_BR
dc.contributor.authorAdriano, C.pt_BR
dc.contributor.authorGaritezi, T. M.pt_BR
dc.contributor.authorRosa, P. F. S.pt_BR
dc.contributor.authorFerreira, Leticie Mendoncapt_BR
dc.contributor.authorGarcia, Fláviopt_BR
dc.contributor.authorAzevedo, Gustavo de Medeirospt_BR
dc.contributor.authorPagliuso, P. G.pt_BR
dc.date.accessioned2014-09-23T02:12:51Zpt_BR
dc.date.issued2011pt_BR
dc.identifier.issn0031-9007pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/103666pt_BR
dc.description.abstractThe Fe K x-ray absorption near edge structure of BaFe₂-xCoxAs₂ superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides experimental support to previous ab initio calculations in which the extra Co electron is concentrated at the substitute site and do not change the electronic occupation of the Fe ions. Superconductivity may emerge due to bonding modifications induced by the substitute atom that weakens the spin-density-wave ground state by reducing the Fe local moments and/or increasing the elastic energy penalty of the accompanying orthorhombic distortion.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review letters. Melville. Vol. 107, no. 26 (Dec. 2011), 267402, 5 p.pt_BR
dc.rightsOpen Accessen
dc.subjectFísica da matéria condensadapt_BR
dc.subjectEstrutura eletrônicapt_BR
dc.subjectEspectros de absorção de raios-xpt_BR
dc.subjectSupercondutividadept_BR
dc.subjectMateriais supercondutorespt_BR
dc.subjectXanespt_BR
dc.subjectCompostos de ferropt_BR
dc.subjectCompostos de báriopt_BR
dc.titleCo-cubstitution effects on the Fe valence in the BaFe2As2 superconducting compound : a study of hard x-ray absorption spectroscopypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000817307pt_BR
dc.type.originEstrangeiropt_BR


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